Sales people have a complete and valid reason to actually follow the changing stance, but rather than ruining their image, it actually improves it by proving they can adapt to the customer's situation. In that regards, he is not a hypocrite as he's (hopefully) delivering facts of what is better than the other, and only being a "liar" by omitting the opposing argument.
I only bring it up because when I was a salesperson, I tried to keep my personal beliefs out of it. Unless they were looking at something that I absolutely supported, in which case, I would talk it up right along with them.
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